The Tor Browser: gfx/skia/trunk/src/images/SkDecodingImageGenerator.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/images/SkDecodingImageGenerator.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/images/SkDecodingImageGenerator.cpp

Sat, 03 Jan 2015 20:18:00 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Sat, 03 Jan 2015 20:18:00 +0100
branch: TOR_BUG_3246
changeset 7: 129ffea94266
permissions: -rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkData.h"
 #include "SkDecodingImageGenerator.h"
 #include "SkImageDecoder.h"
 #include "SkImageInfo.h"
 #include "SkImageGenerator.h"
 #include "SkImagePriv.h"
 #include "SkStream.h"
 #include "SkUtils.h"
 static bool equal_modulo_alpha(const SkImageInfo& a, const SkImageInfo& b) {
     return a.width() == b.width() && a.height() == b.height() &&
            a.colorType() == b.colorType();
 }
 namespace {
 /**
  *  Special allocator used by getPixels(). Uses preallocated memory
  *  provided if possible, else fall-back on the default allocator
  */
 class TargetAllocator : public SkBitmap::Allocator {
 public:
     TargetAllocator(const SkImageInfo& info,
                     void* target,
                     size_t rowBytes)
         : fInfo(info)
         , fTarget(target)
         , fRowBytes(rowBytes)
     {}
     bool isReady() { return (fTarget != NULL); }
     virtual bool allocPixelRef(SkBitmap* bm, SkColorTable* ct) {
         if (NULL == fTarget || !equal_modulo_alpha(fInfo, bm->info())) {
             // Call default allocator.
             return bm->allocPixels(NULL, ct);
         }
         // TODO(halcanary): verify that all callers of this function
         // will respect new RowBytes.  Will be moot once rowbytes belongs
         // to PixelRef.
         bm->installPixels(fInfo, fTarget, fRowBytes, NULL, NULL);
         fTarget = NULL;  // never alloc same pixels twice!
         return true;
     }
 private:
     const SkImageInfo fInfo;
     void* fTarget;  // Block of memory to be supplied as pixel memory
                     // in allocPixelRef.  Must be large enough to hold
                     // a bitmap described by fInfo and fRowBytes
     const size_t fRowBytes;  // rowbytes for the destination bitmap
     typedef SkBitmap::Allocator INHERITED;
 };
 // TODO(halcanary): Give this macro a better name and move it into SkTypes.h
 #ifdef SK_DEBUG
     #define SkCheckResult(expr, value)  SkASSERT((value) == (expr))
 #else
     #define SkCheckResult(expr, value)  (void)(expr)
 #endif
 #ifdef SK_DEBUG
 inline bool check_alpha(SkAlphaType reported, SkAlphaType actual) {
     return ((reported == actual)
             || ((reported == kPremul_SkAlphaType)
                 && (actual == kOpaque_SkAlphaType)));
 }
 #endif  // SK_DEBUG
 }  // namespace
 ////////////////////////////////////////////////////////////////////////////////
 SkDecodingImageGenerator::SkDecodingImageGenerator(
         SkData* data,
         SkStreamRewindable* stream,
         const SkImageInfo& info,
         int sampleSize,
         bool ditherImage)
     : fData(data)
     , fStream(stream)
     , fInfo(info)
     , fSampleSize(sampleSize)
     , fDitherImage(ditherImage)
 {
     SkASSERT(stream != NULL);
     SkSafeRef(fData);  // may be NULL.
 }
 SkDecodingImageGenerator::~SkDecodingImageGenerator() {
     SkSafeUnref(fData);
     fStream->unref();
 }
 bool SkDecodingImageGenerator::getInfo(SkImageInfo* info) {
     if (info != NULL) {
         *info = fInfo;
     }
     return true;
 }
 SkData* SkDecodingImageGenerator::refEncodedData() {
     // This functionality is used in `gm --serialize`
     // Does not encode options.
     if (fData != NULL) {
         return SkSafeRef(fData);
     }
     // TODO(halcanary): SkStreamRewindable needs a refData() function
     // which returns a cheap copy of the underlying data.
     if (!fStream->rewind()) {
         return NULL;
     }
     size_t length = fStream->getLength();
     if (0 == length) {
         return NULL;
     }
     void* buffer = sk_malloc_flags(length, 0);
     SkCheckResult(fStream->read(buffer, length), length);
     fData = SkData::NewFromMalloc(buffer, length);
     return SkSafeRef(fData);
 }
 bool SkDecodingImageGenerator::getPixels(const SkImageInfo& info,
                                          void* pixels,
                                          size_t rowBytes) {
     if (NULL == pixels) {
         return false;
     }
     if (fInfo != info) {
         // The caller has specified a different info.  This is an
         // error for this kind of SkImageGenerator.  Use the Options
         // to change the settings.
         return false;
     }
     if (info.minRowBytes() > rowBytes) {
         // The caller has specified a bad rowBytes.
         return false;
     }
     SkAssertResult(fStream->rewind());
     SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(fStream));
     if (NULL == decoder.get()) {
         return false;
     }
     decoder->setDitherImage(fDitherImage);
     decoder->setSampleSize(fSampleSize);
     SkBitmap bitmap;
     TargetAllocator allocator(fInfo, pixels, rowBytes);
     decoder->setAllocator(&allocator);
     // TODO: need to be able to pass colortype directly to decoder
     SkBitmap::Config legacyConfig = SkColorTypeToBitmapConfig(info.colorType());
     bool success = decoder->decode(fStream, &bitmap, legacyConfig,
                                    SkImageDecoder::kDecodePixels_Mode);
     decoder->setAllocator(NULL);
     if (!success) {
         return false;
     }
     if (allocator.isReady()) {  // Did not use pixels!
         SkBitmap bm;
         SkASSERT(bitmap.canCopyTo(info.colorType()));
         bool copySuccess = bitmap.copyTo(&bm, info.colorType(), &allocator);
         if (!copySuccess || allocator.isReady()) {
             SkDEBUGFAIL("bitmap.copyTo(requestedConfig) failed.");
             // Earlier we checked canCopyto(); we expect consistency.
             return false;
         }
         SkASSERT(check_alpha(info.alphaType(), bm.alphaType()));
     } else {
         SkASSERT(check_alpha(info.alphaType(), bitmap.alphaType()));
     }
     return true;
 }
 SkImageGenerator* SkDecodingImageGenerator::Create(
         SkData* data,
         const SkDecodingImageGenerator::Options& opts) {
     SkASSERT(data != NULL);
     if (NULL == data) {
         return NULL;
     }
     SkStreamRewindable* stream = SkNEW_ARGS(SkMemoryStream, (data));
     SkASSERT(stream != NULL);
     SkASSERT(stream->unique());
     return SkDecodingImageGenerator::Create(data, stream, opts);
 }
 SkImageGenerator* SkDecodingImageGenerator::Create(
         SkStreamRewindable* stream,
         const SkDecodingImageGenerator::Options& opts) {
     SkASSERT(stream != NULL);
     SkASSERT(stream->unique());
     if ((stream == NULL) || !stream->unique()) {
         SkSafeUnref(stream);
         return NULL;
     }
     return SkDecodingImageGenerator::Create(NULL, stream, opts);
 }
 // A contructor-type function that returns NULL on failure.  This
 // prevents the returned SkImageGenerator from ever being in a bad
 // state.  Called by both Create() functions
 SkImageGenerator* SkDecodingImageGenerator::Create(
         SkData* data,
         SkStreamRewindable* stream,
         const SkDecodingImageGenerator::Options& opts) {
     SkASSERT(stream);
     SkAutoTUnref<SkStreamRewindable> autoStream(stream);  // always unref this.
     if (opts.fUseRequestedColorType &&
         (kIndex_8_SkColorType == opts.fRequestedColorType)) {
         // We do not support indexed color with SkImageGenerators,
         return NULL;
     }
     SkAssertResult(autoStream->rewind());
     SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(autoStream));
     if (NULL == decoder.get()) {
         return NULL;
     }
     SkBitmap bitmap;
     decoder->setSampleSize(opts.fSampleSize);
     if (!decoder->decode(stream, &bitmap,
                          SkImageDecoder::kDecodeBounds_Mode)) {
         return NULL;
     }
     if (bitmap.config() == SkBitmap::kNo_Config) {
         return NULL;
     }
     SkImageInfo info = bitmap.info();
     if (!opts.fUseRequestedColorType) {
         // Use default
         if (kIndex_8_SkColorType == bitmap.colorType()) {
             // We don't support kIndex8 because we don't support
             // colortables in this workflow.
             info.fColorType = kPMColor_SkColorType;
         }
     } else {
         if (!bitmap.canCopyTo(opts.fRequestedColorType)) {
             SkASSERT(bitmap.colorType() != opts.fRequestedColorType);
             return NULL;  // Can not translate to needed config.
         }
         info.fColorType = opts.fRequestedColorType;
     }
     return SkNEW_ARGS(SkDecodingImageGenerator,
                       (data, autoStream.detach(), info,
                        opts.fSampleSize, opts.fDitherImage));
 }

The Tor Browser / annotate

gfx/skia/trunk/src/images/SkDecodingImageGenerator.cpp@129ffea94266 (annotated)

gfx/skia/trunk/src/images/SkDecodingImageGenerator.cpp